Rapid Synthesis of a Green Emitting Phosphor by Sulfidation of Intermetallic EuAl2 and its Use in a Hybrid Material

IF 7.2 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Elias C. J. Gießelmann, Stefan Engel, Svenja Pohl, Max Briesenick, Lukas P. Rüthing, Cedric Kloos, Aylin Koldemir, Lars Schumacher, Joshua Wiethölter, Jörn Schmedt auf der Günne, Guido Kickelbick, Oliver Janka
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引用次数: 0

Abstract

Ternary sulfides are usually synthesized from the binary sulfidic precursors at elevated temperatures using prolonged reaction times and sometimes H2S atmosphere to remove residual oxygen. The direct synthesis from the elements is usually hampered by the highly exothermic reaction vaporizing the sulfur. One way to suppress this exothermic reaction is to use a prereacted metallic precursor. In this work, the well-defined and crystalline intermetallic compounds CaAl2, SrAl2, and EuAl2 have been reacted with elemental sulfur in less than 24 h at 1173 K achieving phase pure samples of CaAl2S4, SrAl2S4, and EuAl2S4, according to powder X-ray diffraction. While the first two are extremely sensitive to moisture, the latter is air and moisture stable and could therefore be characterized with respect to its magnetic and luminescent properties as well as by 151Eu Mössbauer spectroscopy. All methods clearly confirm the divalent oxidation state of the Eu atoms. Since CaAl2S4 and SrAl2S4 are diamagnetic materials, we have investigated these by 27Al solid state MAS NMR to verify the crystal structure and gain further information about the local Al environment. Subsequently, three polysiloxane-polysilsesquioxane-based materials with phenyl, naphthyl, and phenanthrenyl groups were used as a water impermeable material to embed powdered EuAl2S4 and investigate the luminescent properties of the resulting hybrid material.

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来源期刊
Chemistry of Materials
Chemistry of Materials 工程技术-材料科学:综合
CiteScore
14.10
自引率
5.80%
发文量
929
审稿时长
1.5 months
期刊介绍: The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.
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